PLAB 1 is the gateway examination for international medical graduates seeking to practise medicine in the United Kingdom. With 180 single best answer (SBA) questions in three hours, the exam tests applied clinical knowledge across the breadth of medical and surgical specialties. Most candidates have limited preparation time, often balancing study with clinical work or other commitments. The difference between a pass and a fail frequently comes down to strategy: knowing which topics carry the most weight and allocating revision time accordingly.
This guide breaks down the highest-yielding PLAB 1 topic areas based on the GMC's published content map and patterns observed across recent sittings [1]. We focus on areas where targeted revision translates most efficiently into marks.
Understanding the PLAB 1 Blueprint
The GMC structures PLAB 1 around clinical presentations rather than traditional subject headings. Questions are mapped to the presenting complaint — "chest pain," "shortness of breath," "vaginal bleeding" — and the candidate must work through the clinical reasoning to reach the correct investigation, diagnosis, or management step. However, certain specialty areas consistently contribute a disproportionate number of questions. Understanding this weighting is the foundation of an efficient study plan.
The exam broadly draws from medicine (including subspecialties), surgery, obstetrics and gynaecology, paediatrics, psychiatry, pharmacology and therapeutics, emergency medicine, ENT, ophthalmology, dermatology, and ethics/law. Not all areas contribute equally.
Emergency Medicine: The Single Highest-Yielding Domain
Emergency presentations dominate PLAB 1. Expect 25-35 questions directly testing acute management, with many additional questions framed as emergency scenarios across other specialties. This is the single most important area to revise thoroughly.
Must-know emergency topics
- Acute coronary syndromes — STEMI vs NSTEMI distinction, immediate management (MONA protocol limitations, primary PCI timelines, dual antiplatelet therapy), ECG recognition of ST elevation, posterior and right ventricular MI patterns
- Anaphylaxis — IM adrenaline dose (500 micrograms or 0.5 ml of 1:1000 in adults), positioning, fluid resuscitation, second-line agents, observation period (biphasic reactions), mast cell tryptase timing
- Sepsis — Sepsis Six bundle (three "in" and three "out" within one hour), NEWS2 scoring, fluid challenge volumes, empirical antibiotic selection by source, escalation criteria for critical care
- Acute asthma and COPD exacerbation — severity grading (moderate, severe, life-threatening, near-fatal), management ladders, indications for NIV in COPD (pH less than 7.35 with PaCO2 greater than 6 kPa), magnesium sulphate threshold in asthma
- Status epilepticus — stepwise benzodiazepine protocol, timing thresholds (5 minutes to convulsive status, 30 minutes to refractory), phenytoin loading, when to call anaesthetics
- Diabetic emergencies — DKA diagnostic criteria (glucose greater than 11, pH less than 7.3, bicarbonate less than 15, ketonaemia greater than 3), fixed-rate insulin infusion, fluid protocol, when to switch to variable rate; HHS diagnostic thresholds and cautious fluid replacement
- Acute upper GI bleeding — Rockall and Blatchford scores, resuscitation priorities, transfusion thresholds, PPI timing, terlipressin for variceal bleeding, when to scope
Clinical pearl
PLAB 1 loves testing the immediate next step in emergency management. A common trap is selecting the correct diagnosis but the wrong management priority. Always think: airway, breathing, circulation — then definitive treatment.
Clinical Pharmacology: High Return on Investment
Pharmacology questions appear both as standalone therapeutics questions and embedded within clinical scenarios. Approximately 15-25 questions per sitting have a pharmacology focus. The yield per hour of revision is exceptionally high because the same drug principles recur predictably.
Top pharmacology themes
- Prescribing in renal impairment — dose adjustment for metformin (eGFR thresholds), gentamicin (levels and dosing intervals), DOACs (apixaban vs rivaroxaban vs dabigatran renal cutoffs), lithium, digoxin
- Drug interactions — warfarin interactions (CYP2C9 inhibitors: fluconazole, metronidazole, amiodarone; inducers: rifampicin, carbamazepine), SSRI interactions with tramadol (serotonin syndrome), macrolides with statins, methotrexate with trimethoprim
- Adverse effects — amiodarone (thyroid, pulmonary fibrosis, corneal deposits, photosensitivity, hepatotoxicity), methotrexate (pancytopenia, hepatotoxicity, pneumonitis), ACE inhibitors (cough, hyperkalaemia, angioedema), statins (myopathy, rhabdomyolysis)
- Drug of choice — first-line agents for common conditions: ramipril for heart failure with reduced ejection fraction, amlodipine for hypertension in Afro-Caribbean patients, carbimazole for Graves' disease, doxycycline for Chlamydia, metronidazole for Clostridioides difficile
- Teratogenic drugs — the "never in pregnancy" list: sodium valproate, methotrexate, ACE inhibitors (second/third trimester), warfarin (first trimester embryopathy), isotretinoin, lithium (Ebstein's anomaly)
Clinical pearl
When a question describes an adverse effect, map it back to the drug mechanism. Knowing that ACE inhibitors cause cough via bradykinin accumulation not only answers the adverse effect question but also explains why ARBs are the alternative.
Obstetrics and Gynaecology: Consistently 15-20 Questions
Obstetrics and gynaecology is tested heavily, and the questions tend to follow recognisable patterns. Candidates who revise these areas systematically can secure a reliable block of marks.
Obstetric essentials
- Pre-eclampsia and eclampsia — diagnostic criteria (hypertension after 20 weeks plus proteinuria or organ dysfunction), severe features, magnesium sulphate regimen for seizure prophylaxis and treatment, labetalol/nifedipine for BP control, delivery as definitive management
- Ectopic pregnancy — risk factors, presentation (amenorrhoea, pain, bleeding, shoulder tip pain), diagnostic pathway (serum beta-hCG plus transvaginal ultrasound), management options (expectant, methotrexate criteria, surgical)
- Postpartum haemorrhage — definition (greater than 500 ml after vaginal delivery), four Ts (tone, trauma, tissue, thrombin), bimanual compression, oxytocin, ergometrine, misoprostol, tranexamic acid, escalation to surgical options
- Gestational diabetes — screening at 24-28 weeks, OGTT thresholds, metformin and insulin use, fetal macrosomia risk, postnatal follow-up with fasting glucose at 6-13 weeks
Gynaecology essentials
- Ectopic and miscarriage management — expectant, medical (misoprostol), and surgical options with their criteria
- Cervical screening and abnormalities — HPV primary screening, colposcopy indications, CIN grading
- Polycystic ovary syndrome — Rotterdam criteria (two of three: oligo/anovulation, hyperandrogenism, polycystic ovaries on ultrasound), first-line management
- Emergency contraception — levonorgestrel (within 72 hours), ulipristal (within 120 hours), copper IUD (most effective, within 5 days)
Paediatrics: Must-Know Topics
Paediatrics typically contributes 15-20 questions. The questions often test recognition of serious childhood presentations and age-appropriate management.
High-yield paediatric areas
- Safeguarding — non-accidental injury patterns (multiple bruises of different ages, metaphyseal fractures in non-mobile infants, retinal haemorrhages), correct escalation pathway, documentation requirements
- Common childhood infections — characteristic rashes (measles: cough, coryza, conjunctivitis, Koplik spots; scarlet fever: sandpaper rash with strawberry tongue; meningococcal: non-blanching purpura), febrile child traffic light system (NICE)
- Neonatal jaundice — physiological vs pathological (onset within 24 hours is always pathological), bilirubin thresholds for phototherapy, exchange transfusion criteria, causes by timing
- Asthma in children — stepwise management (SABA, then add low-dose ICS, then LTRA, then increase ICS, then add LABA), acute management differences from adults
- Developmental milestones — gross motor, fine motor, speech, and social milestones at key ages (6 weeks: social smile; 6 months: sits with support; 12 months: walks with one hand held, 2-3 words; 2 years: runs, 2-word sentences)
- Pyloric stenosis vs intussusception — pyloric stenosis (projectile non-bilious vomiting at 2-8 weeks, olive-shaped mass, hypochloraemic hypokalaemic metabolic alkalosis); intussusception (colicky pain with redcurrant jelly stool, sausage-shaped mass, typically 6-18 months)
Psychiatry: Commonly Tested Areas
Psychiatry consistently contributes 10-15 questions and is an area where many candidates leave marks on the table through inadequate preparation.
Key psychiatry topics
- Mental Health Act — Section 2 (assessment, 28 days, two doctors plus AMHP), Section 3 (treatment, 6 months), Section 5(2) (doctor's holding power, 72 hours), Section 136 (police, place of safety). Know who can apply, duration, and appeal routes
- Capacity and consent — Mental Capacity Act 2005 principles, two-stage capacity test (disturbance of mind/brain, then functional test: understand, retain, weigh, communicate), best interests decision-making, advance decisions, lasting power of attorney
- Depression management — severity grading (PHQ-9), stepped care model, first-line SSRI (sertraline or citalopram), counselling vs CBT, indications for secondary care referral, risk assessment
- Psychosis and schizophrenia — first-rank symptoms, first-episode psychosis management (oral atypical antipsychotic), clozapine criteria (treatment-resistant: failed two antipsychotics), monitoring requirements for clozapine (neutrophil count)
- Substance misuse — alcohol withdrawal (chlordiazepoxide reducing regimen), Wernicke's encephalopathy (IV Pabrinex before glucose), opioid dependence (methadone or buprenorphine), overdose management (naloxone)
- Eating disorders — anorexia nervosa diagnostic criteria, refeeding syndrome risk (phosphate monitoring), MARSIPAN criteria for medical admission
Clinical pearl
Mental Health Act questions are extremely predictable. Memorise the section numbers, durations, and who can apply — these are guaranteed marks.
ENT and Ophthalmology: Quick Wins
ENT and ophthalmology together typically account for 8-12 questions. These are genuinely high-yield because the conditions tested are finite and the answers are often straightforward pattern recognition.
ENT must-knows
- Epistaxis — first aid measures, anterior vs posterior packing, Little's area (Kiesselbach's plexus), silver nitrate cautery, indications for surgical intervention
- Peritonsillar abscess (quinsy) — unilateral swelling, trismus, "hot potato" voice, needle aspiration or incision and drainage, IV antibiotics
- Acute otitis media — most cases are viral (watchful waiting for 48-72 hours), amoxicillin if persistent, complications (mastoiditis, intracranial abscess)
- Sudden sensorineural hearing loss — emergency referral within 24 hours, MRI to exclude vestibular schwannoma, oral corticosteroids
Ophthalmology must-knows
- Acute angle-closure glaucoma — painful red eye, fixed mid-dilated pupil, raised intraocular pressure, haloes around lights, immediate pilocarpine and IV acetazolamide, urgent ophthalmology referral
- Central retinal artery occlusion — painless sudden loss of vision, cherry-red spot on fundoscopy, afferent pupillary defect, no effective treatment but must exclude giant cell arteritis (ESR, temporal artery biopsy)
- Retinal detachment — flashing lights, floaters, curtain-like visual field loss, urgent same-day ophthalmology referral
- Chemical eye injury — immediate copious irrigation (at least 20 minutes with saline or water), pH check, emergency ophthalmology assessment
Building Your Study Plan
With the high-yield areas mapped, structure your preparation as follows:
1. Weeks 1-4: Cover emergency medicine and clinical pharmacology — these two areas alone can account for 40-60 questions
2. Weeks 5-8: Work through obstetrics and gynaecology, paediatrics, and general medicine systematically
3. Weeks 9-10: Revise psychiatry (especially the Mental Health Act and capacity), ENT, ophthalmology, and dermatology — these are the "quick win" specialties
4. Final 2 weeks: Full-length timed practice papers, reviewing weak areas identified from question performance
Use question banks extensively. PLAB 1 rewards applied knowledge, not rote recall. Every topic you revise should be practised through SBA questions to reinforce clinical reasoning.
How MedNext Academy Supports Your PLAB 1 Preparation
MedNext Academy's question bank covers all PLAB 1 content areas with detailed explanations mapped to the GMC content blueprint. Each question includes the clinical reasoning pathway, relevant guidelines, and links to the corresponding study notes. The platform's analytics identify your weakest areas, allowing you to direct revision time where it will have the greatest impact on your score.
References
- General Medical Council. PLAB 1 test content map. gmc-uk.org.